Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbaee8e23019c8e6…

MALICIOUS

PDF

83.1 KB Created: 2021-07-25 03:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e70eb5a7dd02697b67f73efaf57528e1 SHA-1: a6d33f994e445bee49b58c1217103a36212b764c SHA-256: dbaee8e23019c8e671b11cd49aad2611093344cfdccdb843b562501850d482c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms strongly suggests an intent to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://selfmadefilms.nl/userfiles/files/59838648933.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5fab456066436605dbdfa56419ea0029/mazuwi.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/pafizowukebazidukula.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/52945190922.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e9061e3587c958cf8fce34f843cba697/wewedalabebo.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zolelozatunawozitaderi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e7a81a9ef3dc47e6fcedbdd743b33f7d/90344107309.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/27252382487.pdfIn PDF document text
    • http://rafaelokazakov.com/file/releguporafejafig.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/kumt3lf75pj84u504fm5k358g6/kipir.pdfIn PDF document text
    • https://steammining.com/userfiles/file/92915943711.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/73505860066.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3820d892f0---23649145868.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae6226ecb---93687311711.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb6c51a7d---fizoduzuzuvekirupabelu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c6faea7feb17f9adacf35ecd0cc7da08/88635077628.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6a110dafb68ea723e8ca8f764242fb4f/ledojegoxipiridu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a641f20f4db---dodokasesajejixu.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/fukuronan.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a519a184c---rereli.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/jinojilud.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/udo5tfuq469qjff6tdi0pl0bk8/rapuselezonedurixilid.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8d3c3ba4f---11741123968.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/182e9e5308eec478a61d202c7fb31c71/19793770095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=english+file+intermediate+third+edition+testy+pdf+chomikujPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 23316 bytes
SHA-256: adba9885592ac4bb00bb80bb749bff63b4b7584f7f4070d2b2d9346eb6f7b2d4
font_01_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 11484 bytes
SHA-256: 874303f7ca5ddb3d3f908db65daaf1119e9846315c1e78e3ccd9b0f0232dfb96
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1